In Enterprise Architect there is no Undo feature for deleting diagrams, so be certain that you want to delete a diagram before you do so

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When you delete a diagram, you do not delete the elements in the diagram from the model

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In the Corporate, Business and Software Engineering, Systems Engineering and Ultimate editions of Enterprise Architect, if security is enabled you must have Manage Diagrams permission to create new diagrams

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You can also delete multiple diagrams from the Project Browser, by holding ( Ctrl ) or ( Shift ) while you select them, then right-clicking on one of them and selecting the Delete selected items context menu option